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18763: sys/tiny_strerror: add missing error codes r=benpicco a=maribu ### Contribution description When double-checking the error codes provided by newlib by default (without magic defines, such as `__LINUX_ERRNO_EXTENSIONS__` or `__CYGWIN__`), some where still missing in `tiny_strerror()`. This adds the missing ones. This in turn showed that three errno codes were missing in the avr-libc compat `errno.h`, which are added as well. ### Testing procedure Murdock should double check that the added errno codes indeed are defined by default. ### Issues/PRs references None Co-authored-by: Marian Buschsieweke <marian.buschsieweke@ovgu.de>